register_taxonomy() producing error with multisite admins

Greetings. I’m fairly new to custom taxonomies but in using register_taxonomy(), I find it fairly straightforward.

Problem: Have a clean WordPress 3.1 Multi-Site (no plugins activated). Added this code into functions.php for my theme:

[Code moderated as per the Forum Rules. Please use the pastebin]

Confirmed that I was able to access the “Product Categories” taxonomy via the network admin. Then created a new blog with a new admin user. Logged into that child blog as the child blog’s admin, and when attempting to click on “Product Categories” I get the WordPress error:

“Cheat’n huh?”

I’m not clear why this works for the network admin on the primary blog but not for the admin of the child blog. I’ve looked at register_taxonomy() in the codex and not seeing any setting that might effect this. It’s also interesting to note that i’m able to create the custom taxonomy items in the add/edit screen of my custom post type.

Any ideas or thoughts?